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  #11  
Old 18th October 2009, 09:48 PM
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Originally Posted by AV1611VET View Post
1. Why do stagecoach wheels turn backwards in movies?
Our eyes can't keep up with the speed of rotation - us seeing the wheel appear to slow down and change direction is our eyes lagging what's really happening.

2. Does a vacuum cleaner work in a vacuum?
Depends if you want to dump stuff into the vacuum or not.
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  #12  
Old 18th October 2009, 09:53 PM
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Originally Posted by Wiccan_Child View Post
It's a sign from God to go to your GP.


Yes, most definitely.


The scientists at CERN have a backup plan: we give helicopters cancer.

Mad props to XKCD!!!!

(I spent a few years as a graphic artist --not necessarily a good artist-- but usually I detest comics with such bad artwork, but for XKCD I make an exception. It is good.)
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Old 18th October 2009, 09:55 PM
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Originally Posted by Cabal View Post
Our eyes can't keep up with the speed of rotation - us seeing the wheel appear to slow down and change direction is our eyes lagging what's really happening.
Isn't it also a relic of the "sampling rate" of the film? At something like 24fps it's like strobing a water droplet at the wrong frequency and it looks like its running backwards. Am I completely off on this?
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Old 18th October 2009, 09:56 PM
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Originally Posted by Cabal View Post
Our eyes can't keep up with the speed of rotation - us seeing the wheel appear to slow down and change direction is our eyes lagging what's really happening.
Not according to What Einstein Told His Barber, by Robert L. Wolke.
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Old 18th October 2009, 09:59 PM
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Is their a simple way to explain spin of sub atomic particles ?
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  #16  
Old 18th October 2009, 10:07 PM
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Originally Posted by thaumaturgy View Post
Isn't it also a relic of the "sampling rate" of the film? At something like 24fps it's like strobing a water droplet at the wrong frequency and it looks like its running backwards. Am I completely off on this?
True - although I think that's the same thing but with different numbers.

Originally Posted by AV1611VET View Post
Not according to What Einstein Told His Barber, by Robert L. Wolke.
Great. Which was?
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  #17  
Old 18th October 2009, 10:10 PM
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Originally Posted by Wiccan_Child View Post
Urban legend is... urban . You made me doubt myself, so I invoke the mighty powers of the Straight Dope. Who weren't too helpful. But these sources were .

Basically, it's an amorphous solid, in that it has no well-defined melting point. It's molecules are arranged as if they were liquid, but they don't move, like a solid. So it's a solidy liquidy blur.

For all intents and purposes, though, it's a solid. It's hard and shatters when I hit it.
This truly is one of those "great questions". It defies an easy answer.

Here's a link to a discussion of the thermodynamics of glass. (LINKY)

Essentially unlike most crystalline solids in which there is a distinct "melting point" and what is called a first order phase transition as it cools and it doesn't appear to have a "latent heat of fusion" so, many take that to mean it is a supercooled liquid, however there is a second order phase transition which marks other changes in physical features at a certain temperature.

In essence it has a "glass transition temperature", like some polymers. But it goes into an amorphous (ie non-crystalline) phase, but this can affected by the rate of cooling.

The Liquid-->Crystal transition is thermodynamic. It is a change to more energetically stable condition.

The Glass Transition is kinetic. It is not necessarily energetically favorable enough to keep the molecules from continued movement. From what I can gather it isn't a "potential well" where the stable configuration is a hinderance to further molecular movement.

In things like volcanic glasses (obsidian) there are "devitrification" events. You see some crystalline phases form within the glass.

Sounds like this is still a debatable point as to how to correctly classify glass, but it is largely a semantic argument. There are thermodynamic and materials science justifications for a variety of approaches to this question.

As for the ancient window glass. Apparently it has not flowed. That is, as you guys have said, a relic of the glassmaking art of the time (Crown Glass method which winds up with a "spinning step" resulting in thicker bottoms).

Today we apparently use a "float glass" technique which generates nice flat panes.

Summary: You can ask a physicist anything but it takes a chemist to really muck up the waters!
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Old 18th October 2009, 10:12 PM
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Originally Posted by Cabal View Post
Great. Which was?
I'll see if I can explain this w/o quoting the book itself.

It has to do with camera speed.

Say you had a wheel with only one spoke (humor me here for a sec).

The camera snaps when the spoke is at 12:00, then again when the spoke advances to 11:00, 10:00, etc.

Creating the optical illusion that the wheel is turning backwards.
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Old 18th October 2009, 10:13 PM
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Originally Posted by pgp_protector View Post
Is their a simple way to explain spin of sub atomic particles ?
Not according to everyday experience as such - spin is a uniquely and completely quantum effect. Often it applies to things with no apparent internal structure like electrons.*

*That said, I know of a few experiments that would eventually lead to an investigation of whether this was really the case.
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Old 18th October 2009, 10:15 PM
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Originally Posted by AV1611VET View Post
I'll see if I can explain this w/o quoting the book itself.

It has to do with camera speed.

Say you had a wheel with only one spoke (humor me here for a sec).

The camera snaps when the spoke is at 12:00, then again when the spoke advances to 11:00, 10:00, etc.

Creating the optical illusion that the wheel is turning backwards.
Ok, thanks. Maybe I didn't describe it well it enough but as I said to thaum, that does sound like the same thing as the eye but with different numbers involved (i.e. a camera's sample rate isn't going to be the same as that of the human eye per se).
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